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C++ Academy · Lesson

Condition Variables and Worker Patterns

Coordinate threads with std::condition_variable and the classic worker pool pattern.

What is a Condition Variable?

A condition variable lets a thread wait until another thread signals that a condition has changed. Used to coordinate producers and consumers.

std::condition_variable Basics

A condition variable works with a std::mutex and a predicate. The waiting thread releases the lock while waiting and re-acquires it on wake.

#include <condition_variable>
#include <mutex>
#include <queue>

std::mutex mtx;
std::condition_variable cv;
std::queue<int> tasks;
bool done = false;

All lessons in this course

  1. std::thread Joining and Detaching
  2. std::mutex lock_guard and unique_lock
  3. Condition Variables and Worker Patterns
  4. std::async and std::future Basics
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